import tensorflow as tf

state = tf.Variable(0,name='counter')
#print(state.name)
one = tf.constant(1)

new_value=tf.add(state,one)
update=tf.assign(state, new_value)


init = tf.global_variables_initializer();  #must habe if define variable

with tf.Session() as sess:
	sess.run(init)
	for _ in range(3):
		sess.run(update)
		print(sess.run(state))